In a tweet issued Wednesday, Ghostface, lesser known as Dennis Coles, implored his 440,000 followers to support Cho.
"I need yall to check my man @roycho5 website http://www.roycho.com & help get him that CONGRESS SEAT," he tweeted, with a photo of Cho.
Cho is a first-time candidate for public office but previously worked in both the New Jersey governor's office, as well as the Port Authority of New York and New Jersey. He also worked as a correspondence director for former Sen. Byron Dorgan (D-N.D.).
Cho said the endorsement was "pretty unexpected," and originated from an informal chat his sister, who used to work in the music industry, had with the rapper and others at a recent party.
"She just started talking about me as her brother, what I wanted to do, why I wanted to run, and a couple of people there expressed support," including Ghostface, Cho said.
The rapper's manager got in touch with his sister to let her know he wanted to be "helpful" to the campaign, but didn't indicate exactly how or when. Cho said he started following him on Twitter on Wednesday, and hours later he received the tweet.
He believes that his personal story — Cho is the son of Korean immigrants, and has worked in both government and the private sector — and the fact that he's new to politics resonated with Ghostface.
"I think the fact that I'm a young political neophyte running for the first time, someone relatively new to politics, appealed to them," he said.
Cho will face a difficult challenge in his race against Garrett, however. Though the district was redrawn to be more favorable to Democrats, a Republican has won it on the presidential level the past two cycles, and Garrett is a prolific fundraiser.
Though Ghostface is likely aware that cash rules everything around a congressional candidate, Cho said he didn't know whether the rapper would be lending him a hand with future tweets or possibly a fundraiser.